package com.hmdp.service.impl;

import com.hmdp.dto.Result;
import com.hmdp.entity.SeckillVoucher;
import com.hmdp.entity.Voucher;
import com.hmdp.entity.VoucherOrder;
import com.hmdp.mapper.VoucherOrderMapper;
import com.hmdp.service.ISeckillVoucherService;
import com.hmdp.service.IVoucherOrderService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.utils.RedisIdWorker;
import com.hmdp.utils.SimpleRedisLock;
import com.hmdp.utils.UserHolder;
import org.redisson.api.RLock;
import org.redisson.api.RedissonClient;
import org.springframework.aop.framework.AopContext;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import javax.annotation.Resource;
import java.time.LocalDateTime;

/**
 * <p>
 *  服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
public class VoucherOrderServiceImpl extends ServiceImpl<VoucherOrderMapper, VoucherOrder> implements IVoucherOrderService {

    @Resource
    private ISeckillVoucherService seckillVoucherService;

    @Resource
    private RedisIdWorker redisIdWorker;

    @Resource
    private StringRedisTemplate stringRedisTemplate;

    @Resource
    private RedissonClient redissonClient;
    @Override
    public Result seckillVoucher(Long voucherId) {
        SeckillVoucher voucher = seckillVoucherService.getById(voucherId);

        if (voucher.getBeginTime().isAfter(LocalDateTime.now())) {
            return Result.fail("活动未开始");
        }

        if (voucher.getEndTime().isBefore(LocalDateTime.now())) {
            return Result.fail("活动已结束");
        }

        if (voucher.getStock() < 1) {
            return Result.fail("库存不足");
        }

        //创建锁对象
        Long userId = UserHolder.getUser().getId();
//        SimpleRedisLock lock = new SimpleRedisLock("order" + userId, stringRedisTemplate);
        RLock lock = redissonClient.getLock("order" + userId);
        boolean isLock = lock.tryLock();

        //是否拿到锁
        if (!isLock) {
            return Result.fail("不能重复下单");
        }
        try {
            IVoucherOrderService proxy = (IVoucherOrderService) AopContext.currentProxy();
            return proxy.createVoucherOrder(voucherId);
        } finally {
            lock.unlock();
        }

    }

    @Transactional
    public Result createVoucherOrder(Long voucherId) {
        //一人一单
        Long userId = UserHolder.getUser().getId();

            int count = query().eq("user_id", userId).eq("voucher_id", voucherId).count();
            if (count > 0){
                return Result.fail("每人只能购买一次");
            }

            //扣减库存
            boolean res = seckillVoucherService.update()
                    .setSql("stock = stock - 1")
                    .eq("voucher_id", voucherId).gt("stock", 0)
                    .update();
            if (!res) {
                return Result.fail("库存不足");
            }

            VoucherOrder order = new VoucherOrder();
            Long id = redisIdWorker.nextId("order");
            order.setId(id);


            order.setUserId(userId);

            order.setVoucherId(voucherId);
            save(order);
            return Result.ok(id);
        }
}
